Operating instructions

Parameterizing/addressing
10.4 Description of parameters
SIPART PS2 with and without HART communications
166 Operating Instructions, 09/2008, A5E00074631-08
that may occur. Reverse changes in the valve position, the so-called slip jumps, let the
positioner close at too large a static friction. If slip jumps are detected, the filtered step height
is saved as a slipstick value. If slip jumps no longer exist, the slipstick value is reduced
slowly.
Set the parameter value to "On" to activate the test. Sub-parameters are displayed. Sub-
parameters are described below.
The current value is displayed in the "16 STIC" diagnostics parameter. The positioner
triggers a fault message if the current value exceeds a limit threshold.
Note
Incorrect interpretation in case of actuating times below one second
If the actuating times are less than one second, the positioner does not accurately
differentiate between a normal movement of the actuator and a reverse change. Therefore,
increase the actuating time if required.
The factory setting is "OFF".
d1.LIMIT - limit for slipstick detection
Use this sub-parameter to set the base limit for slipstick detection in percent. Set the base
limit in a range from "0.1" to "100.0".
The factory setting is "1.0".
d2.FACT1 - factor 1
Use this sub-parameter to set the factor for the formation of limit threshold 1. Set the factor in
a range from "0.1" to "100.0". The limit threshold is the product of "d1.LIMIT" and
"d2.FACT1".
The threshold 1 fault message is displayed when the limit threshold 1 exceeds. The process
to activate and display this fault message is described in the "XDIAG" parameter.
The factory setting is "2.0".
d3.FACT2 - factor 2
Use this sub-parameter to set the factor for the formation of limit threshold 2. Set the factor in
a range from "0.1" to "100.0". The limit threshold is the product of "d1.LIMIT" and
"d3.FACT2".
The threshold 2 fault message is displayed when the limit threshold 2 is exceeded. The
process to activate and display this fault message is described in the "XDIAG" parameter.
The factory setting is "5.0".
d4.FACT3 - factor 3
Use this sub-parameter to set the factor for the formation of limit threshold 3. Set the factor in
a range from "0.1" to "100.0". The limit threshold is the product of "d1.LIMIT" and
"d4.FACT3".